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Liquid crystal applications in photonics |
| Vladimir G. CHIGRINOV, |
| Department of Electronic
and Computer Engineering, Hong Kong University of Science and Technology,
Hong Kong, China; |
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Abstract We developed new optical switches based on nematic and ferroelectric liquid crystal (LC) cells for photonics applications. Certain new LC switches based on the effect of total internal reflection in nematic LC and deformed helix ferroelectric effect ferroelectric LC with very fast response time were developed. Fast bistable optical switches of the light polarization based on ferroelectric liquid crystal cells were proposed. The switches are characterized by 100μs switching time and 26dB crosstalk at the wavelength of 632.8nm and bistable, i.e., required zero power consumption in the switch state.
High frequency hysteretic free electrically controlled 0–2π phase modulation of light has been proposed using a very short helix pitch (less than 400nm) deformed helix ferroelectric liquid crystal. The electrically controlled 0–2π hysteretic free phase modulation was achieved at the driving voltage frequency up to 4kHz and the voltage amplitude of 32V. The application of fast V-shaped deformed helix ferroelectric ferroelectric LC (DHF-FLC) for new active-matrix liquid crystal display (LCD) and optical data processing devices is envisaged.
Photoalignment technology can be very useful for the new generation of liquid crystal devices as well as in new photovoltaic, optoelectronic and photonic devices based on highly ordered thin organic layers. We have investigated the LC photoalignment in superthin tubes, which are basic elements of switchable photonic crystal/liquid crystal structures and obtained the order parameter comparable with usual homogeneous nematic LC cells. We studied LC alignment on silicon surfaces with submicrometer-sized straight and curved waveguide profiles. The liquid crystal cladding refractive index was then varied according to the applied voltage, and subsequently the microresonator resonance wavelengths were tuned. Based on our initial measurements, the free spectral range (FSR) wavelength shift within the range of 20nm was obtained, which is comparable with a thermooptic effect. The new voltage controllable Si-based add drop filters are envisaged based on this principle.
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Issue Date: 05 March 2010
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Crossland W A, Clapp T V, Wilkinson T D, Manolis I G, Georgiou A, Robertson B. Liquid crystals in telecommunications systems. Molecular Crystals and Liquid Crystals, 2004, 413: 363–384
doi: 10.1080/15421400490438825
|
|
Beresnev L, Haase W. Ferroelectric liquid crystals:development of materials and fast electrooptical elements for non-displayapplications. Optical Materials, 1998, 9(1–4): 201–211
doi: 10.1016/S0925-3467(97)00079-7
|
|
Hoshi R, Nakatsuhara K, Nakagami T. Optical switching characteristics in Si-waveguide asymmetricMach-Zehnder interferometer having ferroelectric liquid crystal cladding. Electronics Letters, 2006, 42(11): 635–636
doi: 10.1049/el:20060924
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Presnyakov V, Liu Z, Chigrinov V G. Fast optical retarder using deformed-helical ferroelectricliquid crystals. Proceedings of SPIE, 2005, 5970: 59701K
doi: 10.1117/12.629198
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Pozhidaev E, Chigrinov V, Du T, Kotova S, Minchenko M, Vashchenko V, Krivosey A, Fan F. Fast and hysteretic free 0–2π phase modulation of the light in electricallycontrolled weakly deformed short helix pitch ferroelectric liquidcrystal. In: Proceedings of Eurodisplay Conference. 2009, P.41
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Pozhidaev E, Chigrinov V, Hegde G, Xu P. Multistableelectro-optical modes in ferroelectric liquid crystals. Journal of the Society for Information Display, 2009, 25(1): 53–59
doi: 10.1889/JSID17.1.53
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Fujisawa T, Hatsusaka K, Maruyama K, Nishiyama I, Takeuchi K, Takatsu H, Kobayashi S. V-shaped E-O properties of polymer stabilized (PSV-) FLCD free fromconventional surface stabilization: advanced color sequential LCDs. In: Proceedings of IDW’08. 2008, 1563–1566
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Xu P, Chigrinov V, Kwok H S. Optical analysis of a liquid-crystal switch system basedon total internal reflection. Journal ofthe Optical Society of America A, 2008, 25(4): 866–873
doi: 10.1364/JOSAA.25.000866
|
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Semenova Y, Panarin Y, Farrell G, Dovgalets S. Liquid crystal based optical switches. Molecular Crystals and Liquid Crystals, 2004, 413: 385–398
doi: 10.1080/15421400490438852
|
|
Zhuang Z, Kim Y J, Patel J S. Bistable twisted nematic liquid crystal optical switch. Applied Physics Letters, 1999, 75(19): 3008–3010
doi: 10.1063/1.125217
|
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Pozhidaev E P, Chigrinov V G, Du T. Fast switching bistable ferroelectric liquid crystalswitches as new optical elements for photonics applications. In: Proceedings of OptoElectronics and Communications Conference. 2009, FU3
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Muravsky A, Chigrinov V. Optical switch based on nematicliquid crystals. In: Proceedings of IDW’05. 2005, 12(1): 223–224
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Maksimochkin A G, Pasechnik S V, Tsvetkov V A, Yakovlev D A, Maksimochkin G I, Chigrinov V G. Electrically controlled switching of light beams in theplane of liquid crystal layer. Optics Communications, 2007, 270(2): 273–279
doi: 10.1016/j.optcom.2006.09.014
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Chigrinov V G, Kozenkov V M, Kwok H S. Photoalignment of Liquid Crystalline Materials: Physicsand Applications. London: Wiley, 2008
doi: 10.1002/9780470751800
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Haurylau M, Anderson S P, Marshall K L, Fauchet P M. Electrical modulation of silicon-based two-dimensional photonic bandgapstructures. Applied Physics Letters, 2006, 88(6): 061103
doi: 10.1063/1.2172070
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Alagappan G, Sun X, Yu M, Shum P, Den Engelsen D. Tunable dispersion propertiesof liquid crystal infiltrated into a two-dimensional photonic crystal. IEEE Journal of Quantum Electronics, 2006, 42(3,4): 404–409
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Weiss S, Ouyang H, Zhang J, Fauchet P. Electrical and thermal modulation of silicon photonic bandgap microcavitiescontaining liquid crystals. Optics Express, 2005, 13(4): 1090–1097
doi: 10.1364/OPEX.13.001090
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Presnyakov V V, Liu Z, Chigrinov V G. Infiltration of photonic crystal fiber with liquid crystals. Proceedings of SPIE, 2005, 6017: 60170J
doi: 10.1117/12.630994
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Poon A W, Li C, Ma N, Lau S L, Tong D T K, Chigrinov V G. Photonics filters, switches and subsystems for next-generation opticalnetworks. HKIE Transactions, 2004, 11(2): 60–67
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